微细管道内流体流动的黏性耗散分析

Analysis of Flow Resistance of Water in Micro-channels

目前,还没有实验数据和理论分析可以得出在微细管道内流体的黏性对流体流动及换热的影响,而在微细管道(微米级)内流体高速流动中黏性耗散是不能够忽略的,但是没有合理的计算公式进行理论计算。因此,这里对粘性耗散在微细管道流中的影响进行了分析和理论验证。根据已有的分析给定了一个粘性耗散在微细管道流中造成明显影响的最小标准值。

There is little experimental data and theoretical analysis available in the literature to elucidate the mechanisms. It is reasonable to assume that as the dimensions of flow channels approach the micro-level, viscous dissipation could be too significant to be neglected due to a high velocity gradient in the channel. However, no evidence and analysis was presented to verify such an explanation. Therefore, in this paper, the effects of viscous dissipation in microchannel flows are analyzed and examined theoretically. A criterion to draw the limit of the significance of the viscous dissipation effects in the microchannel flows is suggested based on the present analysis.